When I started wearing my new Polar F6, I wore it evertime I worked out and when I checked my weekly calories-burned total (I know it's not solidly accurate - but close enough I think) I was shocked to see I was burning about 2500 - 3600 calories a week. That equals more than an entire day of eating for me.
Maybe such a tool could give you useful data to show your nutritionist when figuring out how many calories you really need?
In my case, I upped my intake (of quality food) and felt better (after being on a plateau) - and lost ten pounds in the following three months without changing anything else. Well actually, I went to bed earlier too.
I love my HR monitor because its gratifying to see the log of my workouts and know when I need more or less.
I applaud your commitment. You are sure to be successful because you are being smart, seeking group support, and doing workouts that you enjoy.
You can do this!
Julie